Chief strategist Steve Bannon supports an exit, while senior adviser Jared Kushner thinks the deal is bad, but would like to find a way to see if the USA emissions targets can be changed.

A number of large American companies were among those advocating for staying in the Paris Agreement, including U.S. energy giants Exxon Mobil and Chevron and their European peers Royal Dutch Shell and BP.

While not mentioning the U.S.by name, Chinese Foreign Ministry spokeswoman Hua Chunying told reporters that climate change is a "global challenge" that no country can ignore. "We should not talk too much about ideologies but more on practical solutions", he said.

So just how big is the U.S.'s climate footprint?

What about the rest of the world?

How large are US CO2 emissions?

The Palestinian authorities have since also signed the agreement, which has now been officially ratified by 147 parties and entered into force in record time on November 4, 2016, when it crossed the threshold of 55 ratifying parties representing 55 per cent of global greenhouse gas emissions. New ExxonMobil CEO Darren Woods recently wrote, "we're encouraged that the pledges made at last year's Paris Accord create an effective framework for all countries to address rising emissions; in fact, our company forecasts carbon reductions consistent with the results of the Paris accord commitments".

Trump has repeatedly expressed doubts about climate change, at times calling it a hoax to weaken USA industry. Climate action is unstoppable.

Trump and officials in his close circle have previously often questioned climate change despite scientific evidence of its existence.

Li was speaking ahead of a two-day summit that begins in Brussels later on Thursday, when China and the European Union will re-commit to free trade and the Paris Agreement in a sweeping rejection of Trump's protectionist policies. However, it seems President Trump's decision regarding the Paris Climate Agreement is going to be the final straw for the renegade tech figure.

"The Paris agreement is not intended as a fig leaf".

The United States committed to reduce its emissions by 26 to 28 percent from 2005 levels by 2025.

But some scientists have pointed out even with the agreement in place, halting global warming at two degrees might be unattainable.

"We are not only talking about the future of European people, we are first and foremost talking about the future of people elsewhere".

What impact would a U.S. withdrawal have?

According to CNN's John D. Sutter, the 2 degrees goal is incredibly consequential.

European leaders pushed Trump to stay in the Paris pact during his recent overseas trip, and some of his advisers prefer the USA stays committed to the climate accord.

Prior to the U.S.' decision, U.N. Secretary-General Antonio Guterres said that it was "absolutely essential" that the world implements the Paris agreement but action can still continue if a country doesn't do so.

Skoog says a withdrawal would damage USA "ambitions in other multilateral negotiations and their work in the United Nations".

However, not all experts agree it will be disastrous for efforts to reach global climate goals.

Trump has said the accord would cost the US economy trillions of dollars without tangible benefit.

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